python - 使用 GitLab CI 和 Python 'onbuild' 镜像，requirements.txt 中的包似乎没有安装

Question

我正在尝试熟悉 Gitlab CI具有测试项目的环境，https://gitlab.com/khpeek/CI-test 。该项目具有以下 .gitlab-ci.yml:

image: python:2.7-onbuild
services:
  - rethinkdb:latest
test_job:
  script:
    - pytest

问题是 CI 管道中的 test_job 作业失败并显示以下错误消息:

Running with gitlab-ci-multi-runner 9.0.1 (a3da309)
  on docker-auto-scale (e11ae361)
Using Docker executor with image python:2.7-onbuild ...
Starting service rethinkdb:latest ...
Pulling docker image rethinkdb:latest ...
Using docker image rethinkdb:latest ID=sha256:23ecfb08823bc5483c6a955b077a9bc82899a0df2f33899b64992345256f22dd for service rethinkdb...
Waiting for services to be up and running...
Using docker image sha256:aaecf574604a31dd49a9d4151b11739837e4469df1cf7b558787048ce4ba81aa ID=sha256:aaecf574604a31dd49a9d4151b11739837e4469df1cf7b558787048ce4ba81aa for predefined container...
Pulling docker image python:2.7-onbuild ...
Using docker image python:2.7-onbuild ID=sha256:5754a7fac135b9cae7e02e34cc7ba941f03a33fb00cf31f12fbb71b8d389ece2 for build container...
Running on runner-e11ae361-project-3083420-concurrent-0 via runner-e11ae361-machine-1491819341-82630004-digital-ocean-2gb...
Cloning repository...
Cloning into '/builds/khpeek/CI-test'...
Checking out d0937f33 as master...
Skipping Git submodules setup
$ pytest
/bin/bash: line 56: pytest: command not found
ERROR: Job failed: exit code 1

但是，存储库中有一个 requirements.txt，其中包含单行 pytest==3.0.7。在我看来来自Dockerfile但是，python:2.7-onbuild 镜像的 pip install -rrequirements.txt 应该在构建时运行。那么为什么找不到 pytest 呢？

Answer 1

如果你看Dockerfile如果您链接到，您会看到 pip install -rrequirements.txt 是 onbuild 的一部分命令。如果您想从第一个容器创建一个新容器并安装一堆需求，这非常有用。因此，pip install -rrequirements.txt 命令不会在 CI 管道的容器内执行，如果是的话，它会在一开始就执行，甚至在克隆 gitlab 存储库之前执行。

我建议您这样修改 .gitlab-ci.yml 文件

image: python:2.7-onbuild
services:
  - rethinkdb:latest
test_job:
  script:
    - pip install -r requirements.txt
    - pytest